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<div class="title">nrf51/Source/twi_master/twi_sw_master.c</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00013"></a>00013 <span class="preprocessor">#include &lt;stdbool.h&gt;</span>
<a name="l00014"></a>00014 <span class="preprocessor">#include &lt;stdint.h&gt;</span>
<a name="l00015"></a>00015 <span class="preprocessor">#include &quot;<a class="code" href="twi__master_8h.html" title="Software controlled TWI Master driver.">twi_master.h</a>&quot;</span>
<a name="l00016"></a>00016 <span class="preprocessor">#include &quot;nrf_delay.h&quot;</span>
<a name="l00017"></a>00017 
<a name="l00018"></a>00018 <span class="preprocessor">#include &quot;twi_master_config.h&quot;</span>
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="comment">/*lint -e415 -e845 -save &quot;Out of bounds access&quot; */</span>
<a name="l00021"></a>00021 <span class="preprocessor">#define NRF_GPIO_PINCONFIG(pin_number) *((&amp;NRF_GPIO-&gt;PIN_CNF[0])+(pin_number&lt;&lt;2))</span>
<a name="l00022"></a>00022 <span class="preprocessor"></span><span class="preprocessor">#define TWI_SDA_STANDARD0_NODRIVE1() do { \</span>
<a name="l00023"></a>00023 <span class="preprocessor">        NRF_GPIO_PINCONFIG(TWI_MASTER_CONFIG_DATA_PIN_NUMBER) = (GPIO_PIN_CNF_SENSE_Disabled &lt;&lt; GPIO_PIN_CNF_SENSE_Pos) \</span>
<a name="l00024"></a>00024 <span class="preprocessor">        |(GPIO_PIN_CNF_DRIVE_S0D1 &lt;&lt; GPIO_PIN_CNF_DRIVE_Pos)    \</span>
<a name="l00025"></a>00025 <span class="preprocessor">        |(GPIO_PIN_CNF_PULL_Pullup &lt;&lt; GPIO_PIN_CNF_PULL_Pos)  \</span>
<a name="l00026"></a>00026 <span class="preprocessor">        |(GPIO_PIN_CNF_INPUT_Connect &lt;&lt; GPIO_PIN_CNF_INPUT_Pos) \</span>
<a name="l00027"></a>00027 <span class="preprocessor">        |(GPIO_PIN_CNF_DIR_Input &lt;&lt; GPIO_PIN_CNF_DIR_Pos);  \</span>
<a name="l00028"></a>00028 <span class="preprocessor">} while (0) </span>
<a name="l00031"></a>00031 <span class="preprocessor">#define TWI_SCL_STANDARD0_NODRIVE1() do { \</span>
<a name="l00032"></a>00032 <span class="preprocessor">        NRF_GPIO_PINCONFIG(TWI_MASTER_CONFIG_CLOCK_PIN_NUMBER) = (GPIO_PIN_CNF_SENSE_Disabled &lt;&lt; GPIO_PIN_CNF_SENSE_Pos) \</span>
<a name="l00033"></a>00033 <span class="preprocessor">        |(GPIO_PIN_CNF_DRIVE_S0D1 &lt;&lt; GPIO_PIN_CNF_DRIVE_Pos)    \</span>
<a name="l00034"></a>00034 <span class="preprocessor">        |(GPIO_PIN_CNF_PULL_Pullup &lt;&lt; GPIO_PIN_CNF_PULL_Pos)  \</span>
<a name="l00035"></a>00035 <span class="preprocessor">        |(GPIO_PIN_CNF_INPUT_Connect &lt;&lt; GPIO_PIN_CNF_INPUT_Pos) \</span>
<a name="l00036"></a>00036 <span class="preprocessor">        |(GPIO_PIN_CNF_DIR_Input &lt;&lt; GPIO_PIN_CNF_DIR_Pos);  \</span>
<a name="l00037"></a>00037 <span class="preprocessor">} while (0) </span>
<a name="l00040"></a>00040 <span class="preprocessor"></span><span class="comment">/*lint -restore */</span>
<a name="l00041"></a>00041 
<a name="l00042"></a>00042 <span class="preprocessor">#ifndef TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE</span>
<a name="l00043"></a>00043 <span class="preprocessor"></span><span class="preprocessor">#define TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE (0UL) //!&lt; Unit is number of empty loops. Timeout for SMBus devices is 35 ms. Set to zero to disable slave timeout altogether.</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span>
<a name="l00046"></a>00046 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_clear_bus(<span class="keywordtype">void</span>);
<a name="l00047"></a>00047 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_issue_startcondition(<span class="keywordtype">void</span>);
<a name="l00048"></a>00048 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_issue_stopcondition(<span class="keywordtype">void</span>);
<a name="l00049"></a>00049 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_clock_byte(uint_fast8_t databyte);
<a name="l00050"></a>00050 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_clock_byte_in(uint8_t *databyte, <span class="keywordtype">bool</span> ack);
<a name="l00051"></a>00051 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_wait_while_scl_low(<span class="keywordtype">void</span>);
<a name="l00052"></a>00052 
<a name="l00053"></a>00053 <span class="keywordtype">bool</span> <a class="code" href="group__lib__driver__twi__master.html#ga148f1dd10bc0248c6c6c5336ce07a540">twi_master_init</a>(<span class="keywordtype">void</span>)
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055     <span class="comment">// Configure both pins to output Standard 0, No-drive (open-drain) 1</span>
<a name="l00056"></a>00056     TWI_SDA_STANDARD0_NODRIVE1(); <span class="comment">/*lint !e416 &quot;Creation of out of bounds pointer&quot; */</span>
<a name="l00057"></a>00057     TWI_SCL_STANDARD0_NODRIVE1(); <span class="comment">/*lint !e416 &quot;Creation of out of bounds pointer&quot; */</span>
<a name="l00058"></a>00058 
<a name="l00059"></a>00059     <span class="comment">// Configure SCL as output</span>
<a name="l00060"></a>00060     <a class="code" href="group__lib__driver__twi__master.html#ga7635564961ef4b40ebe54c566b25dc75">TWI_SCL_HIGH</a>();
<a name="l00061"></a>00061     <a class="code" href="group__lib__driver__twi__master.html#gaa73e62b201f371e4d2e543f0ba2bb4cb">TWI_SCL_OUTPUT</a>();
<a name="l00062"></a>00062 
<a name="l00063"></a>00063     <span class="comment">// Configure SDA as output</span>
<a name="l00064"></a>00064     <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00065"></a><a class="code" href="group__lib__driver__twi__master.html#ga148f1dd10bc0248c6c6c5336ce07a540">00065</a>     <a class="code" href="group__lib__driver__twi__master.html#gaa6c311f207bff59456fb22648965c53b">TWI_SDA_OUTPUT</a>();
<a name="l00066"></a>00066 
<a name="l00067"></a>00067     <span class="keywordflow">return</span> twi_master_clear_bus();
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069 
<a name="l00070"></a>00070 <span class="keywordtype">bool</span> <a class="code" href="group__lib__driver__twi__master.html#ga36e8039d4cbb4f66c0cf0cf1e3a72445">twi_master_transfer</a>(uint8_t address, uint8_t *data, uint8_t data_length, <span class="keywordtype">bool</span> issue_stop_condition)
<a name="l00071"></a>00071 {
<a name="l00072"></a>00072     <span class="keywordtype">bool</span> transfer_succeeded = <span class="keyword">true</span>;
<a name="l00073"></a>00073 
<a name="l00074"></a>00074     transfer_succeeded &amp;= twi_master_issue_startcondition();
<a name="l00075"></a>00075     transfer_succeeded &amp;= twi_master_clock_byte(address);
<a name="l00076"></a>00076 
<a name="l00077"></a>00077     <span class="keywordflow">if</span> (address &amp; <a class="code" href="group__lib__driver__twi__master.html#ga67c0f91739433360f513b097acf11946" title="If this bit is set in the address field, transfer direction is from slave to master.">TWI_READ_BIT</a>)
<a name="l00078"></a>00078     {
<a name="l00079"></a>00079         <span class="comment">/* Transfer direction is from Slave to Master */</span>
<a name="l00080"></a>00080         <span class="keywordflow">while</span> (data_length-- &amp;&amp; transfer_succeeded)
<a name="l00081"></a>00081         {
<a name="l00082"></a><a class="code" href="group__lib__driver__twi__master.html#ga36e8039d4cbb4f66c0cf0cf1e3a72445">00082</a>             <span class="comment">// To indicate to slave that we&#39;ve finished transferring last data byte</span>
<a name="l00083"></a>00083             <span class="comment">// we need to NACK the last transfer.</span>
<a name="l00084"></a>00084             <span class="keywordflow">if</span> (data_length == 0)
<a name="l00085"></a>00085             {
<a name="l00086"></a>00086                 transfer_succeeded &amp;= twi_master_clock_byte_in(data, (<span class="keywordtype">bool</span>)<span class="keyword">false</span>);
<a name="l00087"></a>00087             }
<a name="l00088"></a>00088             <span class="keywordflow">else</span>
<a name="l00089"></a>00089             {
<a name="l00090"></a>00090                 transfer_succeeded &amp;= twi_master_clock_byte_in(data, (<span class="keywordtype">bool</span>)<span class="keyword">true</span>);
<a name="l00091"></a>00091             }
<a name="l00092"></a>00092             data++;
<a name="l00093"></a>00093         }
<a name="l00094"></a>00094     }
<a name="l00095"></a>00095     <span class="keywordflow">else</span>
<a name="l00096"></a>00096     {
<a name="l00097"></a>00097         <span class="comment">/* Transfer direction is from Master to Slave */</span>
<a name="l00098"></a>00098         <span class="keywordflow">while</span> (data_length-- &amp;&amp; transfer_succeeded)
<a name="l00099"></a>00099         {
<a name="l00100"></a>00100             transfer_succeeded &amp;= twi_master_clock_byte(*data);
<a name="l00101"></a>00101             data++;
<a name="l00102"></a>00102         }
<a name="l00103"></a>00103     }
<a name="l00104"></a>00104 
<a name="l00105"></a>00105     <span class="keywordflow">if</span> (issue_stop_condition || !transfer_succeeded)
<a name="l00106"></a>00106     {
<a name="l00107"></a>00107         transfer_succeeded &amp;= twi_master_issue_stopcondition();
<a name="l00108"></a>00108     }
<a name="l00109"></a>00109 
<a name="l00110"></a>00110     <span class="keywordflow">return</span> transfer_succeeded;
<a name="l00111"></a>00111 }
<a name="l00112"></a>00112 
<a name="l00120"></a>00120 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_clear_bus(<span class="keywordtype">void</span>)
<a name="l00121"></a>00121 {
<a name="l00122"></a>00122     <span class="keywordtype">bool</span> bus_clear;
<a name="l00123"></a>00123 
<a name="l00124"></a>00124     <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00125"></a>00125     <a class="code" href="group__lib__driver__twi__master.html#ga7635564961ef4b40ebe54c566b25dc75">TWI_SCL_HIGH</a>();
<a name="l00126"></a>00126     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00127"></a>00127 
<a name="l00128"></a>00128 
<a name="l00129"></a>00129     <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 1 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 1)
<a name="l00130"></a>00130     {
<a name="l00131"></a>00131         bus_clear = <span class="keyword">true</span>;
<a name="l00132"></a>00132     }
<a name="l00133"></a>00133     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 1)
<a name="l00134"></a>00134     {
<a name="l00135"></a>00135         bus_clear = <span class="keyword">false</span>;
<a name="l00136"></a>00136         <span class="comment">// Clock max 18 pulses worst case scenario(9 for master to send the rest of command and 9 for slave to respond) to SCL line and wait for SDA come high</span>
<a name="l00137"></a>00137         <span class="keywordflow">for</span> (uint_fast8_t i=18; i--;)
<a name="l00138"></a>00138         {
<a name="l00139"></a>00139             <a class="code" href="group__lib__driver__twi__master.html#gafef260a0ebd7d5669cd2731d2c20f55d">TWI_SCL_LOW</a>();
<a name="l00140"></a>00140             <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00141"></a>00141             <a class="code" href="group__lib__driver__twi__master.html#ga7635564961ef4b40ebe54c566b25dc75">TWI_SCL_HIGH</a>();
<a name="l00142"></a>00142             <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00143"></a>00143 
<a name="l00144"></a>00144             <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 1)
<a name="l00145"></a>00145             {
<a name="l00146"></a>00146                 bus_clear = <span class="keyword">true</span>;
<a name="l00147"></a>00147                 <span class="keywordflow">break</span>;
<a name="l00148"></a>00148             }
<a name="l00149"></a>00149         }
<a name="l00150"></a>00150     }
<a name="l00151"></a>00151     <span class="keywordflow">else</span>
<a name="l00152"></a>00152     {
<a name="l00153"></a>00153         bus_clear = <span class="keyword">false</span>;
<a name="l00154"></a>00154     }
<a name="l00155"></a>00155 
<a name="l00156"></a>00156     <span class="keywordflow">return</span> bus_clear;
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158 
<a name="l00168"></a>00168 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_issue_startcondition(<span class="keywordtype">void</span>)
<a name="l00169"></a>00169 {
<a name="l00170"></a>00170 <span class="preprocessor">#if 0</span>
<a name="l00171"></a>00171 <span class="preprocessor"></span>    <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 1 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 1)
<a name="l00172"></a>00172     {
<a name="l00173"></a>00173         <span class="comment">// Pull SDA low</span>
<a name="l00174"></a>00174         <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00175"></a>00175     }
<a name="l00176"></a>00176     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 1 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 0)
<a name="l00177"></a>00177     {
<a name="l00178"></a>00178         <span class="comment">// Issue Stop by pulling SDA high</span>
<a name="l00179"></a>00179         <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00180"></a>00180         <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00181"></a>00181 
<a name="l00182"></a>00182         <span class="comment">// Then Start by pulling SDA low</span>
<a name="l00183"></a>00183         <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00184"></a>00184     }
<a name="l00185"></a>00185     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 0 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 0)
<a name="l00186"></a>00186     {
<a name="l00187"></a>00187         <span class="comment">// First pull SDA high</span>
<a name="l00188"></a>00188         <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00189"></a>00189 
<a name="l00190"></a>00190         <span class="comment">// Then SCL high</span>
<a name="l00191"></a>00191         <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00192"></a>00192         {
<a name="l00193"></a>00193             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00194"></a>00194         }
<a name="l00195"></a>00195 
<a name="l00196"></a>00196         <span class="comment">// Then SDA low</span>
<a name="l00197"></a>00197         <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00198"></a>00198     }
<a name="l00199"></a>00199     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 0 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 1)
<a name="l00200"></a>00200     {
<a name="l00201"></a>00201         <span class="comment">// SCL high</span>
<a name="l00202"></a>00202         <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00203"></a>00203         {
<a name="l00204"></a>00204             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00205"></a>00205         }
<a name="l00206"></a>00206 
<a name="l00207"></a>00207         <span class="comment">// Then SDA low</span>
<a name="l00208"></a>00208         <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00209"></a>00209     }
<a name="l00210"></a>00210 
<a name="l00211"></a>00211     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00212"></a>00212     <a class="code" href="group__lib__driver__twi__master.html#gafef260a0ebd7d5669cd2731d2c20f55d">TWI_SCL_LOW</a>();
<a name="l00213"></a>00213 <span class="preprocessor">#endif</span>
<a name="l00214"></a>00214 <span class="preprocessor"></span>
<a name="l00215"></a>00215     <span class="comment">// Make sure both SDA and SCL are high before pulling SDA low.</span>
<a name="l00216"></a>00216     <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00217"></a>00217     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00218"></a>00218     <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00219"></a>00219     {
<a name="l00220"></a>00220         <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00221"></a>00221     }
<a name="l00222"></a>00222 
<a name="l00223"></a>00223     <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00224"></a>00224     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00225"></a>00225 
<a name="l00226"></a>00226     <span class="comment">// Other module function expect SCL to be low</span>
<a name="l00227"></a>00227     <a class="code" href="group__lib__driver__twi__master.html#gafef260a0ebd7d5669cd2731d2c20f55d">TWI_SCL_LOW</a>();
<a name="l00228"></a>00228     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00229"></a>00229 
<a name="l00230"></a>00230     <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232 
<a name="l00242"></a>00242 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_issue_stopcondition(<span class="keywordtype">void</span>)
<a name="l00243"></a>00243 {
<a name="l00244"></a>00244 <span class="preprocessor">#if 0</span>
<a name="l00245"></a>00245 <span class="preprocessor"></span>    <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 1 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 1)
<a name="l00246"></a>00246     {
<a name="l00247"></a>00247         <span class="comment">// Issue start, then issue stop</span>
<a name="l00248"></a>00248 
<a name="l00249"></a>00249         <span class="comment">// Pull SDA low to issue START</span>
<a name="l00250"></a>00250         <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00251"></a>00251         <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00252"></a>00252 
<a name="l00253"></a>00253         <span class="comment">// Pull SDA high while SCL is high to issue STOP</span>
<a name="l00254"></a>00254         <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00255"></a>00255     }
<a name="l00256"></a>00256     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 1 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 0)
<a name="l00257"></a>00257     {
<a name="l00258"></a>00258         <span class="comment">// Pull SDA high while SCL is high to issue STOP</span>
<a name="l00259"></a>00259         <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00260"></a>00260     }
<a name="l00261"></a>00261     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 0 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 0)
<a name="l00262"></a>00262     {
<a name="l00263"></a>00263         <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00264"></a>00264         {
<a name="l00265"></a>00265             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00266"></a>00266         }
<a name="l00267"></a>00267 
<a name="l00268"></a>00268         <span class="comment">// Pull SDA high while SCL is high to issue STOP</span>
<a name="l00269"></a>00269         <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00270"></a>00270     }
<a name="l00271"></a>00271     <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 0 &amp;&amp; <a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>() == 1)
<a name="l00272"></a>00272     {
<a name="l00273"></a>00273         <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00274"></a>00274         <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00275"></a>00275 
<a name="l00276"></a>00276         <span class="comment">// SCL high</span>
<a name="l00277"></a>00277         <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00278"></a>00278         {
<a name="l00279"></a>00279             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00280"></a>00280         }
<a name="l00281"></a>00281 
<a name="l00282"></a>00282         <span class="comment">// Pull SDA high while SCL is high to issue STOP</span>
<a name="l00283"></a>00283         <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00284"></a>00284     }
<a name="l00285"></a>00285 
<a name="l00286"></a>00286     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00287"></a>00287 <span class="preprocessor">#endif</span>
<a name="l00288"></a>00288 <span class="preprocessor"></span>
<a name="l00289"></a>00289     <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00290"></a>00290     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00291"></a>00291     <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00292"></a>00292     {
<a name="l00293"></a>00293         <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00294"></a>00294     }
<a name="l00295"></a>00295 
<a name="l00296"></a>00296     <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00297"></a>00297     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00298"></a>00298 
<a name="l00299"></a>00299     <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00300"></a>00300 }
<a name="l00301"></a>00301 
<a name="l00315"></a>00315 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_clock_byte(uint_fast8_t databyte)
<a name="l00316"></a>00316 {
<a name="l00317"></a>00317     <span class="keywordtype">bool</span> transfer_succeeded = <span class="keyword">true</span>;
<a name="l00318"></a>00318 
<a name="l00319"></a>00319     <span class="comment">// Make sure SDA is an output</span>
<a name="l00320"></a>00320     <a class="code" href="group__lib__driver__twi__master.html#gaa6c311f207bff59456fb22648965c53b">TWI_SDA_OUTPUT</a>();
<a name="l00321"></a>00321 
<a name="l00322"></a>00322     <span class="comment">// MSB first</span>
<a name="l00323"></a>00323     <span class="keywordflow">for</span> (uint_fast8_t i = 0x80; i != 0; i&gt;&gt;=1)
<a name="l00324"></a>00324     {
<a name="l00325"></a>00325         <a class="code" href="group__lib__driver__twi__master.html#gafef260a0ebd7d5669cd2731d2c20f55d">TWI_SCL_LOW</a>();
<a name="l00326"></a>00326         <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00327"></a>00327 
<a name="l00328"></a>00328         <span class="keywordflow">if</span> (databyte &amp; i)
<a name="l00329"></a>00329         {
<a name="l00330"></a>00330             <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00331"></a>00331         }
<a name="l00332"></a>00332         <span class="keywordflow">else</span>
<a name="l00333"></a>00333         {
<a name="l00334"></a>00334             <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00335"></a>00335         }
<a name="l00336"></a>00336 
<a name="l00337"></a>00337         <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00338"></a>00338         {
<a name="l00339"></a>00339             transfer_succeeded = <span class="keyword">false</span>; <span class="comment">// Timeout</span>
<a name="l00340"></a>00340             <span class="keywordflow">break</span>;
<a name="l00341"></a>00341         }
<a name="l00342"></a>00342     }
<a name="l00343"></a>00343 
<a name="l00344"></a>00344     <span class="comment">// Finish last data bit by pulling SCL low</span>
<a name="l00345"></a>00345     <a class="code" href="group__lib__driver__twi__master.html#gafef260a0ebd7d5669cd2731d2c20f55d">TWI_SCL_LOW</a>();
<a name="l00346"></a>00346     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00347"></a>00347 
<a name="l00348"></a>00348     <span class="comment">// Configure TWI_SDA pin as input for receiving the ACK bit</span>
<a name="l00349"></a>00349     <a class="code" href="group__lib__driver__twi__master.html#ga63ae25f476902e9df0c31b057e2bb527">TWI_SDA_INPUT</a>();
<a name="l00350"></a>00350 
<a name="l00351"></a>00351     <span class="comment">// Give some time for the slave to load the ACK bit on the line</span>
<a name="l00352"></a>00352     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00353"></a>00353 
<a name="l00354"></a>00354     <span class="comment">// Pull SCL high and wait a moment for SDA line to settle</span>
<a name="l00355"></a>00355     <span class="comment">// Make sure slave is not stretching the clock</span>
<a name="l00356"></a>00356     transfer_succeeded &amp;= twi_master_wait_while_scl_low();
<a name="l00357"></a>00357 
<a name="l00358"></a>00358     <span class="comment">// Read ACK/NACK. NACK == 1, ACK == 0</span>
<a name="l00359"></a>00359     transfer_succeeded &amp;= !(<a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>());
<a name="l00360"></a>00360 
<a name="l00361"></a>00361     <span class="comment">// Finish ACK/NACK bit clock cycle and give slave a moment to release control</span>
<a name="l00362"></a>00362     <span class="comment">// of the SDA line</span>
<a name="l00363"></a>00363     <a class="code" href="group__lib__driver__twi__master.html#gafef260a0ebd7d5669cd2731d2c20f55d">TWI_SCL_LOW</a>();
<a name="l00364"></a>00364     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00365"></a>00365 
<a name="l00366"></a>00366     <span class="comment">// Configure TWI_SDA pin as output as other module functions expect that</span>
<a name="l00367"></a>00367     <a class="code" href="group__lib__driver__twi__master.html#gaa6c311f207bff59456fb22648965c53b">TWI_SDA_OUTPUT</a>();
<a name="l00368"></a>00368 
<a name="l00369"></a>00369     <span class="keywordflow">return</span> transfer_succeeded;
<a name="l00370"></a>00370 }
<a name="l00371"></a>00371 
<a name="l00385"></a>00385 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_clock_byte_in(uint8_t *databyte, <span class="keywordtype">bool</span> ack)
<a name="l00386"></a>00386 {
<a name="l00387"></a>00387     uint_fast8_t byte_read = 0;
<a name="l00388"></a>00388     <span class="keywordtype">bool</span> transfer_succeeded = <span class="keyword">true</span>;
<a name="l00389"></a>00389 
<a name="l00390"></a>00390     <span class="comment">// Make sure SDA is an input</span>
<a name="l00391"></a>00391     <a class="code" href="group__lib__driver__twi__master.html#ga63ae25f476902e9df0c31b057e2bb527">TWI_SDA_INPUT</a>();
<a name="l00392"></a>00392 
<a name="l00393"></a>00393     <span class="comment">// SCL state is guaranteed to be high here</span>
<a name="l00394"></a>00394 
<a name="l00395"></a>00395     <span class="comment">// MSB first</span>
<a name="l00396"></a>00396     <span class="keywordflow">for</span> (uint_fast8_t i = 0x80; i != 0; i&gt;&gt;=1)
<a name="l00397"></a>00397     {
<a name="l00398"></a>00398         <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00399"></a>00399         {
<a name="l00400"></a>00400             transfer_succeeded = <span class="keyword">false</span>;
<a name="l00401"></a>00401             <span class="keywordflow">break</span>;
<a name="l00402"></a>00402         }
<a name="l00403"></a>00403 
<a name="l00404"></a>00404         <span class="keywordflow">if</span> (<a class="code" href="group__lib__driver__twi__master.html#ga0a7e559c3bceb5b50ff3e51cabb21f73">TWI_SDA_READ</a>())
<a name="l00405"></a>00405         {
<a name="l00406"></a>00406             byte_read |= i;
<a name="l00407"></a>00407         }
<a name="l00408"></a>00408         <span class="keywordflow">else</span>
<a name="l00409"></a>00409         {
<a name="l00410"></a>00410             <span class="comment">// No need to do anything</span>
<a name="l00411"></a>00411         }
<a name="l00412"></a>00412 
<a name="l00413"></a>00413         <a class="code" href="group__lib__driver__twi__master.html#gafef260a0ebd7d5669cd2731d2c20f55d">TWI_SCL_LOW</a>();
<a name="l00414"></a>00414         <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00415"></a>00415     }
<a name="l00416"></a>00416 
<a name="l00417"></a>00417     <span class="comment">// Make sure SDA is an output before we exit the function</span>
<a name="l00418"></a>00418     <a class="code" href="group__lib__driver__twi__master.html#gaa6c311f207bff59456fb22648965c53b">TWI_SDA_OUTPUT</a>();
<a name="l00419"></a>00419 
<a name="l00420"></a>00420     *databyte = (uint8_t)byte_read;
<a name="l00421"></a>00421 
<a name="l00422"></a>00422     <span class="comment">// Send ACK bit</span>
<a name="l00423"></a>00423 
<a name="l00424"></a>00424     <span class="comment">// SDA high == NACK, SDA low == ACK</span>
<a name="l00425"></a>00425     <span class="keywordflow">if</span> (ack)
<a name="l00426"></a>00426     {
<a name="l00427"></a>00427         <a class="code" href="group__lib__driver__twi__master.html#ga6b884c7770898bf063884f3f1893d492">TWI_SDA_LOW</a>();
<a name="l00428"></a>00428     }
<a name="l00429"></a>00429     <span class="keywordflow">else</span>
<a name="l00430"></a>00430     {
<a name="l00431"></a>00431         <a class="code" href="group__lib__driver__twi__master.html#ga112251118224f5623c20423efce89ae8">TWI_SDA_HIGH</a>();
<a name="l00432"></a>00432     }
<a name="l00433"></a>00433 
<a name="l00434"></a>00434     <span class="comment">// Let SDA line settle for a moment</span>
<a name="l00435"></a>00435     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00436"></a>00436 
<a name="l00437"></a>00437     <span class="comment">// Drive SCL high to start ACK/NACK bit transfer</span>
<a name="l00438"></a>00438     <span class="comment">// Wait until SCL is high, or timeout occurs</span>
<a name="l00439"></a>00439     <span class="keywordflow">if</span> (!twi_master_wait_while_scl_low())
<a name="l00440"></a>00440     {
<a name="l00441"></a>00441         transfer_succeeded = <span class="keyword">false</span>; <span class="comment">// Timeout</span>
<a name="l00442"></a>00442     }
<a name="l00443"></a>00443 
<a name="l00444"></a>00444     <span class="comment">// Finish ACK/NACK bit clock cycle and give slave a moment to react</span>
<a name="l00445"></a>00445     <a class="code" href="group__lib__driver__twi__master.html#gafef260a0ebd7d5669cd2731d2c20f55d">TWI_SCL_LOW</a>();
<a name="l00446"></a>00446     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00447"></a>00447 
<a name="l00448"></a>00448     <span class="keywordflow">return</span> transfer_succeeded;
<a name="l00449"></a>00449 }
<a name="l00450"></a>00450 
<a name="l00460"></a>00460 <span class="keyword">static</span> <span class="keywordtype">bool</span> twi_master_wait_while_scl_low(<span class="keywordtype">void</span>)
<a name="l00461"></a>00461 {
<a name="l00462"></a>00462 <span class="preprocessor">#if TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE != 0</span>
<a name="l00463"></a>00463 <span class="preprocessor"></span>    uint32_t <span class="keyword">volatile</span> timeout_counter = TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE;
<a name="l00464"></a>00464 <span class="preprocessor">#endif</span>
<a name="l00465"></a>00465 <span class="preprocessor"></span>
<a name="l00466"></a>00466     <span class="comment">// Pull SCL high just in case if something left it low</span>
<a name="l00467"></a>00467     <a class="code" href="group__lib__driver__twi__master.html#ga7635564961ef4b40ebe54c566b25dc75">TWI_SCL_HIGH</a>();
<a name="l00468"></a>00468     <a class="code" href="group__lib__driver__twi__master.html#ga0bdffa7178084c5e1b2e11d3a95c5e85">TWI_DELAY</a>();
<a name="l00469"></a>00469 
<a name="l00470"></a>00470     <span class="keywordflow">while</span> (<a class="code" href="group__lib__driver__twi__master.html#ga45cf9fc8c9487711c3b8457b8e1116b2">TWI_SCL_READ</a>() == 0)
<a name="l00471"></a>00471     {
<a name="l00472"></a>00472         <span class="comment">// If SCL is low, one of the slaves is busy and we must wait</span>
<a name="l00473"></a>00473 
<a name="l00474"></a>00474 <span class="preprocessor">#if TWI_MASTER_TIMEOUT_COUNTER_LOAD_VALUE != 0</span>
<a name="l00475"></a>00475 <span class="preprocessor"></span>        <span class="keywordflow">if</span> (timeout_counter-- == 0)
<a name="l00476"></a>00476         {
<a name="l00477"></a>00477             <span class="comment">// If timeout_detected, return false</span>
<a name="l00478"></a>00478             <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00479"></a>00479         }
<a name="l00480"></a>00480 <span class="preprocessor">#endif</span>
<a name="l00481"></a>00481 <span class="preprocessor"></span>    }
<a name="l00482"></a>00482 
<a name="l00483"></a>00483     <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00484"></a>00484 }
<a name="l00485"></a>00485 
<a name="l00486"></a>00486 <span class="comment">/*lint --flb &quot;Leave library region&quot; */</span>
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